Hydraulic vehicle wheel brake



April 16, 1940. J. F. BRADY HYDRAULIC `VEHICLE www; BRAKE h Filed Fab. 7. 1959 2 sheets-sheet 1 In@ ef @mmm Attolfneys APF 16, 1940' J. F. BRADY HYDRAULIC VEHICLE 'WHEEL BRAKE l 2 sheets-sheet 2 File-d Feb. '7. le

Patented Apr. 16, 1940 UNITED N STATES mimmo VEHICLE WHEEL BRAKE John F. Brady, sewickiey, Pa., amnnr of onehalf tu Eduarda wright. neem, r.

Application February '1, 193e, sub1 Nn. 255,156* c 1 1 claim. (ci. rss-isz) j This invention relates to brakes for the wheels of motor vehicles.

In accordance with the present invention an hydraulic vehicle wheel brake is provided y, that will insure emcient brake action at all times and practically under `any and all conditions;

will require little, if any repair work, and practically no adjustment between replacement of Vbrake linings.

The invention together with its objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawings whereinl5 Figure 1 is an elevational view of the brake.

Figure 2 is a longitudinal sectional view there- Y through.

\ Figure 3 is a fragmentary side elevational view illustrating certain features hereinafter more fully referred to, and

Figure 4 is a sectional view through an oil cylinder forming part of the invention.

.Referring more in detail to the drawings it will be seen that I indicates generallyV the end or cover plate for the drum of a vehicle wheel and adapted to be mounted in a more or less conventional manner on the axle housing in proper association with the brake drum (not shown). I

In accordance withthe present invention the brake is provided with four segmental brake sh 3 equi-distantly spaced apart.

Each brake shoe 3 is mounted on the plate Ir through the medium of spacer blocks I4 secured to the plate I through the medium of screws or other fastening elements I5'. l

Each spacer block Il is provided with a pair of spaced guide pins I4' and to accommodate the pins I4 the body of each shoe 3 is provided 40 with slots I2 permitting proper radial movement of the shoe. The shoes are retained in proper engagement with the guide pins I4 through the medium.' of washer and cotter pin assemblies indicated generally by the reference numeral I3. For each brake shoe 3 there is provided an hydraulic cylinder 6 in which operates a piston 3. Each cylinder 6 is provided with -a cap 1 oi rubber or other. suitable material and the' cap 'I at the centerthereof is provided with a slot to accommodate an extension v3avc`-f the brake shoe. The extension 3a of the shoe extends through the slot in the cap 'I and is engaged by the piston 9 so that movement of the piston, 55 in response to hydraulic pressure will be transfor vehicle'v wheels and more particularly to a. hydraulic brake braking engagement with the ange'of 'the brake' 4plug 2l.

muted "tothe shoe 3 for moving the same into drum. The extension A3a is `flat andof considerable width with its endengaging a slot 9' in the piston.V Y 5 Each cylinder 6 is mounted on the plate I of the brakethrough the medium of a combination `bracket and spacer plate I'I mounted onthe plate I through -themeclium of screws or other` fastening elements 'I5.- l.

The wall of each cylinder 6, the spacer plate I1, and the brake plate I are provided with aligned -openings forming for each cylinder a drain outlet for which there is provided a suitable The uid from the master vcylinderloi. the' hydraulic brake system is supplied to the brake cylinders 6 through the medium of conduits I6 that connect with' the cylinders 6 as clearly shown, 20

Each brake shoe 3 is yieldably retained in a released position through the medium of pairs of coil springs 5.

The coil springs 5 are suitably connected at one end thereof with a brake shoe and at an 25 opposite end thereof with an anchoring annulus or ange la. a

It will thusv be seen that when the brakes are applied the fluid from the master cylinder of the hydraulic brake systemwill feed to the cylinders 3o l I 6 through the conduits I6 and act on the pistons 9 in a manner to force the brake shoes: 3 into brake-applyingengagement with the brake drum.

Upon release of the uid pressure on the pistons 3 springs 5 will act on the shoes to retract the same, that is to move thepshoes inwardly out of engagement with the brake drum.

' The shoes 3 are equipped in the usual manner with linings 4, and in actual practice it will be found that regardless of the wear on the linings I, or the condition of -s/uch linings the shoes 3 will at all time have proper contact with the 1 drum to insure ka. positive and eicient braking action.

Also, and as shown for each piston 9 there is provided a cup washer I0 and interposed between the washer I Il and the end wall of each cylinder lisa. coil spring II which will prevent the washer I 0 from .seating at the inner end of the construction, utility, operation and advantages of a vehicle wheel brake embodying the features of the present invention will be had without a 'more detailed description.

Having thusdescribed the invention what is claimed as new is:

In a hydraulic, brake for vehicle wheels, a stationary back plate, posts' carried by the plate and each having a spaced pair of projections on its free end, a plurality of brake shoes each including a flange portion having slots therein through which the projections pass, a at centrally arranged extension at the inner edge of each flange part, a plurality of hydraulic cylinders, blocks connected with side portions of said cylinders and with the back plate, a piston in each cylinder having a receiving the flat extension of a brake shoe, means for introducing compressed uid into the cylinders to move the pistons outwardly, a pair of springs connecting the flange part of each brake shoe with a stationary part of the back plate to normally hold the shoe in inoperative position, the cylinder being arranged between said springs and a drain conduit passing froman interior of the cylinder through the supporting block and a. portion of the back plate and a plug vfor closing that part of the conduit.` which passes through the back plate.

JOHN F. BRADY.

slot in its outer face for isv 

